Google reportedly bought Mastercard data to link online ads with offline purchases

If you’re a Mastercard holder in the US, Google has reportedly been tracking whether your buying habits are influenced by online ads in your offline purchases for the past year. The secret deal between the two companies was brokered after four years of negotiation, according to a Bloomberg report published today.

Neither Google nor Mastercard have publicly announced the partnership, and neither company let its customers know that their offline purchases made in stores are being tracked through Mastercard purchase histories and correlated with online ad interactions. Both Google and Mastercard say that the data is anonymized in order to protect personally identifiable information.

Google reportedly paid Mastercard millions of dollars for...

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